No change in Texture Paint Brush Sensitivity on changing Pressure Curves
In Blender2.79 ,Texture Paint has an "Accumulate" Option[Texture Paint Mode->Tools->texDraw brush-->Accumulate] which allows the TexDraw brush to daub strokes on top of the previous daub.This makes the brush daub thicker and hence visible.  

However,this option is "OFF" by default. By toggling it "ON" the Accumulate featured is turned "On" and a visible brush stroke is rendered (also pressure sensitivity is supported) .